Impacts of Satellite-Observed Winds and Total Precipitable Water on WRF Short-Range Forecasts over the Indian Region during the 2006 Summer Monsoon
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Impacts of Satellite-Observed Winds and Total Precipitable Water
on WRF Short-Range Forecasts over the Indian Region
during the 2006 Summer Monsoon
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| Creator |
V, Rakesh
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| Subject |
Meteorology and Climatology
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| Description |
Assimilation experiments have been performed with theWeather Research and Forecasting (WRF) model’s
three-dimensional variational data assimilation (3DVAR) scheme to assess the impacts of NASA’s Quick
Scatterometer (QuikSCAT) near-surface winds, and Special Sensor Microwave Imager (SSM/I) wind speed
and total precipitable water (TPW) on the analysis and on short-range forecasts over the Indian region. The
control (without satellite data) as well asWRF 3DVAR sensitivity runs (which assimilated satellite data) were
made for 48 h starting daily at 0000 UTC during July 2006. The impacts of assimilating the different satellite
datasetweremeasured in comparison to the control run,which does not assimilate any satellite data. The spatial
distribution of the forecast impacts (FIs) for wind, temperature, and humidity from 1-month assimilation experiments
for July 2006 demonstrated that on an average, for 24- and 48-h forecasts, the satellite data provided
useful information.Among the experiments,WRF wind speed prediction was improved by QuikSCAT surface
wind and SSM/I TPW assimilation, while temperature and humidity prediction was improved due to the assimilation
of SSM/I TPW. The rainfall prediction has also been improved significantly due to the assimilation of
SSM/I TPW, with the largest improvement seen over the west coast of India. Through an improvement of the
surface wind field, theQuikSCAT data also yielded a positive impact on the precipitation, particularly for day 1
forecasts. In contrast, the assimilation of SSM/I wind speed degraded the humidity and rainfall predictions
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| Publisher |
American Meteorological Society
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| Date |
2009-12
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/83/1/WAF.pdf
V, Rakesh (2009) Impacts of Satellite-Observed Winds and Total Precipitable Water on WRF Short-Range Forecasts over the Indian Region during the 2006 Summer Monsoon. Weathar & Forecasting, 24 (6). pp. 1706-1731. ISSN 0882-8156 |
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| Relation |
http://www.ametsoc.org/pubs/journals/waf/index.html
http://cir.cmmacs.ernet.in/83/ |
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